The new effort pushes Google's investment to more than $1 billion in Iowa.

The move comes four years after Google opened the center in Council Bluffs. The center that supports Google's search, gmail, maps and Google+ employs 130 workers.

"We have now invested over a billion dollars in Iowa. We hope we’ve given Iowa more than a billion reasons to be optimistic and confident for our future together," said Google Data Center Operations Manager Chris Russell.

Google also announced Thursday that it plans to invest $75 million in an Iowa wind farm as part of its effort to encourage development of cleaner energy sources.

The deal announced Thursday gives Google Inc. a stake in the Ropey Wind Farm in Greene County, Iowa. RPM Access LLC is the primary owner.

The wind farm is located about 130 miles northeast of Council Bluffs, which is home to one the eight data centers that power Google's Internet search engine and other services.

The Iowa data center won't be getting power from the wind farm.

The high electricity demand of Google's massive data centers is one of the reasons the company backs energy projects that cause less pollution than traditional power plants.

Google's investments in renewable energy now exceed $990 million.

Google first announced it would build a data center in Iowa in 2007 and another one in 2012. The company said it has invested $900 million in the state and created 130 jobs.

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